Which rhythm is associated with a very rapid rate that can lead to congestive heart failure or myocardial ischemia and carries a risk of pulmonary and cerebral emboli?

Which rhythm is associated with a very rapid rate that can lead to congestive heart failure or myocardial ischemia and carries a risk of pulmonary and cerebral emboli?

• A. Atrial Tachycardia
• B. Atrial Flutter
• C. Atrial Fibrillation
• D. Junctional Escape Rhythm

Answer: (B)

Atrial flutter features a very fast atrial rate, typically around 250–350 beats per minute, with the ventricles driven by the AV node at a rapid but variable rhythm depending on conduction. When the ventricular response is very fast, the heart spends less time filling between beats, which lowers stroke volume and cardiac output. That reduced perfusion, combined with increased heart rate, raises myocardial oxygen demand and can precipitate heart failure or myocardial ischemia, especially in patients with existing coronary disease or limited reserve.

At the same time, the atria are beating so quickly and ineffectively that blood can pool and form clots within the left atrium or left atrial appendage. If a thrombus forms and breaks off, it can travel to the brain and cause a cerebral embolic event. Embolic risk is a well-recognized concern with sustained atrial flutter (and with atrial arrhythmias in general) if anticoagulation is not used.

Junctional escape rhythm is typically slower and does not produce a rapid rate with the same hemodynamic consequences or embolic risk. Atrial tachycardia can be fast, but the classic, severe hemodynamic compromise and the characteristic high-rate atrial activity with a sawtooth pattern point to atrial flutter in this scenario, along with the embolic concern.